/*
// <copyright>
// dotNetRDF is free and open source software licensed under the MIT License
// -------------------------------------------------------------------------
// 
// Copyright (c) 2009-2017 dotNetRDF Project (http://dotnetrdf.org/)
// 
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is furnished
// to do so, subject to the following conditions:
// 
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
// </copyright>
*/

#if UNFINISHED

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace VDS.RDF.Parsing.Events
{
    public class DualEventQueue<T> 
        : BaseEventQueue<T> where T : IEvent
    {
        private IEventQueue<T> _queue;
        private Queue<T> _temp = new Queue<T>();

        public DualEventQueue(IEventQueue<T> queue)
        {
            this._queue = queue;
        }

        public override T Dequeue()
        {
            if (this._temp.Count > 0)
            {
                return this._temp.Dequeue();
            }
            else
            {
                return this._queue.Dequeue();
            }
        }

        public override void Enqueue(T e)
        {
            this._queue.Enqueue(e);
        }

        public void Requeue(T e)
        {
            this._temp.Enqueue(e);
        }

        public override T Peek()
        {
            if (this._temp.Count > 0)
            {
                return this._temp.Peek();
            }
            else
            {
                return this._queue.Peek();
            }
        }

        public override void Clear()
        {
            this._temp.Clear();
            this._queue.Clear();
        }

        public override int Count
        {
            get 
            {
                return this._temp.Count + this._queue.Count; 
            }
        }
    }
}

#endif